feat: implemented user role impersonation

backend/src/server/plugins/auth/inject-assume-privilege.ts

@@ -0,0 +1,19 @@
+import { requestContext } from "@fastify/request-context";
+import fp from "fastify-plugin";
+
+import { AuthMode } from "@app/services/auth/auth-type";
+
+export const injectAssumePrivilege = fp(async (server: FastifyZodProvider) => {
+  server.addHook("onRequest", async (req) => {
+    const assumeRoleCookie = req.cookies["infisical-project-assume-privileges"];
+    if (req?.auth?.authMode === AuthMode.JWT && assumeRoleCookie) {
+      const decodedToken = server.services.assumePrivileges.verifyAssumePrivilegeToken(
+        assumeRoleCookie,
+        req.auth.tokenVersionId
+      );
+      if (decodedToken) {
+        requestContext.set("projectAssumeRole", decodedToken);
+      }
+    }
+  });
+});